CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 56,818,000	$ 79,899,000
Restricted cash	2,416,000	1,422,000
Accounts receivable, net of allowances of $1,456 and $1,478 at December 31, 2021 and 2020, respectively	77,046,000	78,614,000
Inventories	19,922,000	26,568,000
Prepaid expenses	5,464,000	6,044,000
Contract assets	18,903,000	18,579,000
Other current assets	1,953,000	2,366,000
Total current assets	182,522,000	213,492,000
Property and equipment, net	16,028,000	16,814,000
Goodwill	32,643,000	32,643,000
Deferred tax assets, net	5,210,000	6,801,000
Other long-term assets	13,454,000	5,958,000
Total assets	274,000,000	305,138,000
Current liabilities:
Accounts payable	26,854,000	21,823,000
Accrued compensation and benefits	35,458,000	29,105,000
Accrued expenses and other current liabilities	37,552,000	42,264,000
Income taxes payable	868,000	1,664,000
Short-term debt	9,158,000	4,941,000
Deferred revenues	87,475,000	87,974,000
Total current liabilities	197,365,000	187,771,000
Long-term debt	160,806,000	202,759,000
Long-term deferred revenues	10,607,000	11,284,000
Operating Lease, Liability, Noncurrent	23,379,000	28,462,000
Operating Lease, Right-of-Use Asset	24,143,000	29,430,000
Other long-term liabilities	5,917,000	7,786,000
Total liabilities	398,074,000	438,062,000
Commitments and contingencies (Note J)
Stockholders' deficit:
Preferred stock, $0.01 par value, 1,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.01 par value, 100,000 shares authorized; 42,339 shares issued and 41,949 shares and 41,356 shares outstanding at December 31, 2018 and 2017, respectively	455,000	442,000
Additional paid-in capital	1,031,633,000	1,036,658,000
Accumulated deficit	(1,126,959,000)	(1,168,347,000)
Treasury stock at cost, net of reissuances, 391 and 983 shares at December 31, 2018 and 2017, respectively	(25,090,000)	0
Accumulated other comprehensive loss	(4,113,000)	(1,677,000)
Total stockholders' deficit	(124,074,000)	(132,924,000)
Total liabilities and stockholders' deficit	$ 274,000,000	$ 305,138,000